Divide the 12 balls into 4 groups of 3's.tvb now,tvbnow,bttvb! }: P. _7 d! u3 ?# z
Weigh group 1 & 25.39.217.77:8898, ]+ g. a% P, q7 M9 y' D2 G0 A6 `! h
then weigh group 2 & 3公仔箱論壇* V r1 q$ D: m/ R) J' E
If the results are Equal & Equal, it means the ball with the different weight is in group 4.' F0 [; C3 D; o0 Y
If the results are Equal & Unequal, it means the ball is in group 3.5.39.217.77:88985 |4 y7 o S A) v( Q; g7 L
If the results are Unequal & Equal, it means the ball is in group 1.
/ k1 j7 f/ Z9 C5 |: |3 d$ @公仔箱論壇If the results are Unequal & Unequal, it means the ball is in group 2.
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Once you determine the group that contains the ball.
/ x8 p! t; U3 |* `5 Ptvb now,tvbnow,bttvbSimply weigh two of the balls |